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` No. 391,510. Pa i-.antaa Oct. 23, 1888.

UNrTED STATES PATENT J AMES M. CARPENTER, OF PAWVTUCKET, RHODE ISLAND.

SCREW-CUTTING DIE.

SPECIFICATION forming part of Letters Patent No. 391,510, datel October 23, 1888.

Application filed June 5, 1888. Serial No. 276,074. (No model.)

To all `w7wm it may concern:

Be it known that I, J AMES M. CARPENTER, of Pawtucket, in the county of Providence and State of Rhode Island, have invented a new and Improved ScreW-Cutting Die, of Which the following is a full, clear, and exact description.

The invention relates to that class of dies 'in Which the die is split and its ends recessed to receive a pin of even diameter, a set-screw passing transversely through one end of the die and bearing against the piu.

The invention consists in a screW-cutting die constructed as hereinafter described and claimed.

Reference is to be had to the accompanying draWings, forming a part of this specification, in Which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a plan view of a sCreW-Cutting die constructed in accordance With this invention. Fig. 2 is a side view thereof. Fig. 3is a Vertical section on the line a; 00 of Fig. 1, and Fig. 4 is a horizontal section on theline g yof Fig. 2.

In employing screW-cutting dies it is found necessary to regulate the size of the cuttingorifice of the die. For this reason Various means have been employed for eXpanding the opening and holding it in eXpande d position, or diminishing the opening, as becomes neces' sary. By my invention I provide a simple and ineXpenSiVe means by Which the adjustment may be readily and effectively made.`

In the construction of this invention I take the ordinary form of screw-cutting die l, split at one side, as at 2, and form a tapering hole, 3, in the die, extending horizontally through one side thereof, With its Walls in the meeting ends of the split portion 2. The die l may then be held in expanded position, as shown in the drawings, by means of a tapering pin, 4, Which may be equal to 01' somewhat shorter than the length of the hole 3, as shown, or may be longer, according to the die used,and Which has its head even With the periphery of the die, so as to present a smooth Surface and not interfere With the seating of the die in the stock. To further eXpand the die and hold it in adjusted position it is simply necessary to eXpand it With a tool and permit the pin 4 to slide farther into the hole 3, or to merely drive the pin into the hole 3. To diminish the cutting-orifice of the die, the latter may first be eXpanded by a tool, and then the piu 4 moved slightly outward in the hole and cut off even With the periphery of the die. In this Wayit Will be seen that a simple and ineXpensive means is provided for expanding ascreW-cutting die, Which requires slight manipulation in making the adjustment.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A screw-cutting die having a Vertical split at one side, a tapering hole parallel with the face of the die, and having its Walls in the meeting ends formed by the split, and a tapering pin located in the tapering hole, substantially as described.

2. A screW-cutting die having a Vertical split at one side, a tapering hole parallelwith the face of the die, and having its walls in the meeting ends formed by the split, and a tapering piu located in the tapering hole and shorter than the hole, substantially as described.

3. The screw cutting die 1, split at one side, as at 2, and having a tapering hole, Eh', parallel With the face of die 1 and extending through the ends formed by split 2, and the tapering pin 4, located in hole 3 and shorter than the same, substantially as described.

J AMES M.- CARPENTER Witnesses:

J. EUGENE OSGOOD, A. F. ANDERSON. 

